x + 3y = 1, -3x – 3y = -15 System of question

Question

x + 3y = 1, -3x – 3y = -15
System of question

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Nho 4 years 2021-08-12T15:57:23+00:00 1 Answers 10 views 0

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  1. minhkhang
    0
    2021-08-12T15:59:14+00:00
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    Step-by-step explanation:

    x + 3y = 1 \\ - 3x - 3y = - 15 \\ x = 1 - 3y \\ - 3(1 - 3y) - 3y = - 15 \\ - 3 + 9y - 3y = - 15 \\ - 3 + 6y = - 15 \\ 6y = - 15 + 3 \\ 6y = - 12 \\ y = - 2

    y = - 2 \\x = 1 - 3y \\ x = 1 - 3( - 2) \\ x = 1 + 6 \\ x = 7

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )